383 400hp Scorpions
#11
Gold Member
Joined: Feb 2007
Posts: 147
Likes: 0
From: new jersey
stainless marine because i have diverter system, wanted to keep it quiet once and while. cmi would not work with corsa. have not run the boat yet. blood marine in lanoka harbor did the install. i will post pictures next weekm had somme powder coating done. hydro steering is next winters project. i hope the props work well
#12
stainless marine because i have diverter system, wanted to keep it quiet once and while. cmi would not work with corsa. have not run the boat yet. blood marine in lanoka harbor did the install. i will post pictures next weekm had somme powder coating done. hydro steering is next winters project. i hope the props work well
#13
Registered

Joined: Apr 2005
Posts: 1,442
Likes: 19
From: Washington, MO
Thanks,

Dave
#14
It is louder not a lot but noticable the engine starboard is a little louder than the port.Might take them out have not decided yet.
As for performance I had it out last weekend and was getting an engine alarm on the port motor so it did not get run hard.I should have it back this week.It should plane quicker as its probably 300 lbs lighter in the rear maybe more will let you know.If you do it CP performance makes really nice blockoffs for the prop exhaust.Will post some pictures when I get it back.
#16
They ran it with the computer on it today did it but is not throwing a code.I know its something stupid or maybe a coil.Hopefully its fixed tomorrow.
#17
Registered

Joined: Apr 2005
Posts: 1,442
Likes: 19
From: Washington, MO
The IAC valve is a little stepper motor control valve mounted on top of the intake with two socket head cap screws right behind the throttle body. When you pull the throttles to idle the throttle body is completely closed and this valve controls the air going into the engine. If you notice the boat runs fine except at idle, this could be it. MerCruiser must have got a bad batch of IAC valves (I believe they are actually a Ford product...)
Got lucky and a MerCruiser dealer close to where I keep my boat had one in stock. $110 and 3 minutes of work later, she is running perfect again.

Good luck with yours!!
#18
Time to plane is wayyyyyy better its has so much more power below 4gs and being 400 lbs lighter it comes right up out of the water.
Top speed is about the same but I had my props done last year by a local guy and the came back a little smaller so I think I am going to get new props and see what happens
#19
Registered

Joined: Dec 2002
Posts: 391
Likes: 9
From: Denmark
#20
Got new 28s coming from BBlades with the lighter weight so still plane better and put me back up to low 70s


